shylie/llvm-project
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
llvm-project/clang-tools-extra/clangd/SourceCode.cpp
Kadir Cetinkaya c24c89d6f0
[clangd] Get rid of unnecessary source transformations in locateMacroAt 
Summary:
All callers are already passing spelling locations to locateMacroAt.
Also there's no point at looking at macro expansion for figuring out undefs as
it is forbidden to have PP directives inside macro bodies.
Also fixes a bug when the previous sourcelocation is unavailable.

Reviewers: sammccall, hokein

Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, usaxena95, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D75259
2020-03-02 13:31:12 +01:00

1050 lines
38 KiB
C++
Raw Blame History

//===--- SourceCode.h - Manipulating source code as strings -----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "SourceCode.h"
#include "Context.h"
#include "FuzzyMatch.h"
#include "Logger.h"
#include "Protocol.h"
#include "refactor/Tweak.h"
#include "clang/AST/ASTContext.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TokenKinds.h"
#include "clang/Driver/Types.h"
#include "clang/Format/Format.h"
#include "clang/Lex/Lexer.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/Token.h"
#include "clang/Tooling/Core/Replacement.h"
#include "clang/Tooling/Syntax/Tokens.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/None.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Errc.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/LineIterator.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/SHA1.h"
#include "llvm/Support/VirtualFileSystem.h"
#include "llvm/Support/xxhash.h"
#include <algorithm>
#include <cstddef>
#include <string>
#include <vector>
namespace clang {
namespace clangd {
// Here be dragons. LSP positions use columns measured in *UTF-16 code units*!
// Clangd uses UTF-8 and byte-offsets internally, so conversion is nontrivial.
// Iterates over unicode codepoints in the (UTF-8) string. For each,
// invokes CB(UTF-8 length, UTF-16 length), and breaks if it returns true.
// Returns true if CB returned true, false if we hit the end of string.
template <typename Callback>
static bool iterateCodepoints(llvm::StringRef U8, const Callback &CB) {
// A codepoint takes two UTF-16 code unit if it's astral (outside BMP).
// Astral codepoints are encoded as 4 bytes in UTF-8, starting with 11110xxx.
for (size_t I = 0; I < U8.size();) {
unsigned char C = static_cast<unsigned char>(U8[I]);
if (LLVM_LIKELY(!(C & 0x80))) { // ASCII character.
if (CB(1, 1))
return true;
++I;
continue;
}
// This convenient property of UTF-8 holds for all non-ASCII characters.
size_t UTF8Length = llvm::countLeadingOnes(C);
// 0xxx is ASCII, handled above. 10xxx is a trailing byte, invalid here.
// 11111xxx is not valid UTF-8 at all. Assert because it's probably our bug.
assert((UTF8Length >= 2 && UTF8Length <= 4) &&
"Invalid UTF-8, or transcoding bug?");
I += UTF8Length; // Skip over all trailing bytes.
// A codepoint takes two UTF-16 code unit if it's astral (outside BMP).
// Astral codepoints are encoded as 4 bytes in UTF-8 (11110xxx ...)
if (CB(UTF8Length, UTF8Length == 4 ? 2 : 1))
return true;
}
return false;
}
// Returns the byte offset into the string that is an offset of \p Units in
// the specified encoding.
// Conceptually, this converts to the encoding, truncates to CodeUnits,
// converts back to UTF-8, and returns the length in bytes.
static size_t measureUnits(llvm::StringRef U8, int Units, OffsetEncoding Enc,
bool &Valid) {
Valid = Units >= 0;
if (Units <= 0)
return 0;
size_t Result = 0;
switch (Enc) {
case OffsetEncoding::UTF8:
Result = Units;
break;
case OffsetEncoding::UTF16:
Valid = iterateCodepoints(U8, [&](int U8Len, int U16Len) {
Result += U8Len;
Units -= U16Len;
return Units <= 0;
});
if (Units < 0) // Offset in the middle of a surrogate pair.
Valid = false;
break;
case OffsetEncoding::UTF32:
Valid = iterateCodepoints(U8, [&](int U8Len, int U16Len) {
Result += U8Len;
Units--;
return Units <= 0;
});
break;
case OffsetEncoding::UnsupportedEncoding:
llvm_unreachable("unsupported encoding");
}
// Don't return an out-of-range index if we overran.
if (Result > U8.size()) {
Valid = false;
return U8.size();
}
return Result;
}
Key<OffsetEncoding> kCurrentOffsetEncoding;
static OffsetEncoding lspEncoding() {
auto *Enc = Context::current().get(kCurrentOffsetEncoding);
return Enc ? *Enc : OffsetEncoding::UTF16;
}
// Like most strings in clangd, the input is UTF-8 encoded.
size_t lspLength(llvm::StringRef Code) {
size_t Count = 0;
switch (lspEncoding()) {
case OffsetEncoding::UTF8:
Count = Code.size();
break;
case OffsetEncoding::UTF16:
iterateCodepoints(Code, [&](int U8Len, int U16Len) {
Count += U16Len;
return false;
});
break;
case OffsetEncoding::UTF32:
iterateCodepoints(Code, [&](int U8Len, int U16Len) {
++Count;
return false;
});
break;
case OffsetEncoding::UnsupportedEncoding:
llvm_unreachable("unsupported encoding");
}
return Count;
}
llvm::Expected<size_t> positionToOffset(llvm::StringRef Code, Position P,
bool AllowColumnsBeyondLineLength) {
if (P.line < 0)
return llvm::make_error<llvm::StringError>(
llvm::formatv("Line value can't be negative ({0})", P.line),
llvm::errc::invalid_argument);
if (P.character < 0)
return llvm::make_error<llvm::StringError>(
llvm::formatv("Character value can't be negative ({0})", P.character),
llvm::errc::invalid_argument);
size_t StartOfLine = 0;
for (int I = 0; I != P.line; ++I) {
size_t NextNL = Code.find('\n', StartOfLine);
if (NextNL == llvm::StringRef::npos)
return llvm::make_error<llvm::StringError>(
llvm::formatv("Line value is out of range ({0})", P.line),
llvm::errc::invalid_argument);
StartOfLine = NextNL + 1;
}
StringRef Line =
Code.substr(StartOfLine).take_until([](char C) { return C == '\n'; });
// P.character may be in UTF-16, transcode if necessary.
bool Valid;
size_t ByteInLine = measureUnits(Line, P.character, lspEncoding(), Valid);
if (!Valid && !AllowColumnsBeyondLineLength)
return llvm::make_error<llvm::StringError>(
llvm::formatv("{0} offset {1} is invalid for line {2}", lspEncoding(),
P.character, P.line),
llvm::errc::invalid_argument);
return StartOfLine + ByteInLine;
}
Position offsetToPosition(llvm::StringRef Code, size_t Offset) {
Offset = std::min(Code.size(), Offset);
llvm::StringRef Before = Code.substr(0, Offset);
int Lines = Before.count('\n');
size_t PrevNL = Before.rfind('\n');
size_t StartOfLine = (PrevNL == llvm::StringRef::npos) ? 0 : (PrevNL + 1);
Position Pos;
Pos.line = Lines;
Pos.character = lspLength(Before.substr(StartOfLine));
return Pos;
}
Position sourceLocToPosition(const SourceManager &SM, SourceLocation Loc) {
// We use the SourceManager's line tables, but its column number is in bytes.
FileID FID;
unsigned Offset;
std::tie(FID, Offset) = SM.getDecomposedSpellingLoc(Loc);
Position P;
P.line = static_cast<int>(SM.getLineNumber(FID, Offset)) - 1;
bool Invalid = false;
llvm::StringRef Code = SM.getBufferData(FID, &Invalid);
if (!Invalid) {
auto ColumnInBytes = SM.getColumnNumber(FID, Offset) - 1;
auto LineSoFar = Code.substr(Offset - ColumnInBytes, ColumnInBytes);
P.character = lspLength(LineSoFar);
}
return P;
}
bool isSpelledInSource(SourceLocation Loc, const SourceManager &SM) {
if (Loc.isMacroID()) {
std::string PrintLoc = SM.getSpellingLoc(Loc).printToString(SM);
if (llvm::StringRef(PrintLoc).startswith("<scratch") ||
llvm::StringRef(PrintLoc).startswith("<command line>"))
return false;
}
return true;
}
llvm::Optional<Range> getTokenRange(const SourceManager &SM,
const LangOptions &LangOpts,
SourceLocation TokLoc) {
if (!TokLoc.isValid())
return llvm::None;
SourceLocation End = Lexer::getLocForEndOfToken(TokLoc, 0, SM, LangOpts);
if (!End.isValid())
return llvm::None;
return halfOpenToRange(SM, CharSourceRange::getCharRange(TokLoc, End));
}
bool isValidFileRange(const SourceManager &Mgr, SourceRange R) {
if (!R.getBegin().isValid() || !R.getEnd().isValid())
return false;
FileID BeginFID;
size_t BeginOffset = 0;
std::tie(BeginFID, BeginOffset) = Mgr.getDecomposedLoc(R.getBegin());
FileID EndFID;
size_t EndOffset = 0;
std::tie(EndFID, EndOffset) = Mgr.getDecomposedLoc(R.getEnd());
return BeginFID.isValid() && BeginFID == EndFID && BeginOffset <= EndOffset;
}
bool halfOpenRangeContains(const SourceManager &Mgr, SourceRange R,
SourceLocation L) {
assert(isValidFileRange(Mgr, R));
FileID BeginFID;
size_t BeginOffset = 0;
std::tie(BeginFID, BeginOffset) = Mgr.getDecomposedLoc(R.getBegin());
size_t EndOffset = Mgr.getFileOffset(R.getEnd());
FileID LFid;
size_t LOffset;
std::tie(LFid, LOffset) = Mgr.getDecomposedLoc(L);
return BeginFID == LFid && BeginOffset <= LOffset && LOffset < EndOffset;
}
bool halfOpenRangeTouches(const SourceManager &Mgr, SourceRange R,
SourceLocation L) {
return L == R.getEnd() || halfOpenRangeContains(Mgr, R, L);
}
SourceLocation includeHashLoc(FileID IncludedFile, const SourceManager &SM) {
assert(SM.getLocForEndOfFile(IncludedFile).isFileID());
FileID IncludingFile;
unsigned Offset;
std::tie(IncludingFile, Offset) =
SM.getDecomposedExpansionLoc(SM.getIncludeLoc(IncludedFile));
bool Invalid = false;
llvm::StringRef Buf = SM.getBufferData(IncludingFile, &Invalid);
if (Invalid)
return SourceLocation();
// Now buf is "...\n#include <foo>\n..."
// and Offset points here: ^
// Rewind to the preceding # on the line.
assert(Offset < Buf.size());
for (;; --Offset) {
if (Buf[Offset] == '#')
return SM.getComposedLoc(IncludingFile, Offset);
if (Buf[Offset] == '\n' || Offset == 0) // no hash, what's going on?
return SourceLocation();
}
}
static unsigned getTokenLengthAtLoc(SourceLocation Loc, const SourceManager &SM,
const LangOptions &LangOpts) {
Token TheTok;
if (Lexer::getRawToken(Loc, TheTok, SM, LangOpts))
return 0;
// FIXME: Here we check whether the token at the location is a greatergreater
// (>>) token and consider it as a single greater (>). This is to get it
// working for templates but it isn't correct for the right shift operator. We
// can avoid this by using half open char ranges in getFileRange() but getting
// token ending is not well supported in macroIDs.
if (TheTok.is(tok::greatergreater))
return 1;
return TheTok.getLength();
}
// Returns location of the last character of the token at a given loc
static SourceLocation getLocForTokenEnd(SourceLocation BeginLoc,
const SourceManager &SM,
const LangOptions &LangOpts) {
unsigned Len = getTokenLengthAtLoc(BeginLoc, SM, LangOpts);
return BeginLoc.getLocWithOffset(Len ? Len - 1 : 0);
}
// Returns location of the starting of the token at a given EndLoc
static SourceLocation getLocForTokenBegin(SourceLocation EndLoc,
const SourceManager &SM,
const LangOptions &LangOpts) {
return EndLoc.getLocWithOffset(
-(signed)getTokenLengthAtLoc(EndLoc, SM, LangOpts));
}
// Converts a char source range to a token range.
static SourceRange toTokenRange(CharSourceRange Range, const SourceManager &SM,
const LangOptions &LangOpts) {
if (!Range.isTokenRange())
Range.setEnd(getLocForTokenBegin(Range.getEnd(), SM, LangOpts));
return Range.getAsRange();
}
// Returns the union of two token ranges.
// To find the maximum of the Ends of the ranges, we compare the location of the
// last character of the token.
static SourceRange unionTokenRange(SourceRange R1, SourceRange R2,
const SourceManager &SM,
const LangOptions &LangOpts) {
SourceLocation Begin =
SM.isBeforeInTranslationUnit(R1.getBegin(), R2.getBegin())
? R1.getBegin()
: R2.getBegin();
SourceLocation End =
SM.isBeforeInTranslationUnit(getLocForTokenEnd(R1.getEnd(), SM, LangOpts),
getLocForTokenEnd(R2.getEnd(), SM, LangOpts))
? R2.getEnd()
: R1.getEnd();
return SourceRange(Begin, End);
}
// Given a range whose endpoints may be in different expansions or files,
// tries to find a range within a common file by following up the expansion and
// include location in each.
static SourceRange rangeInCommonFile(SourceRange R, const SourceManager &SM,
const LangOptions &LangOpts) {
// Fast path for most common cases.
if (SM.isWrittenInSameFile(R.getBegin(), R.getEnd()))
return R;
// Record the stack of expansion locations for the beginning, keyed by FileID.
llvm::DenseMap<FileID, SourceLocation> BeginExpansions;
for (SourceLocation Begin = R.getBegin(); Begin.isValid();
Begin = Begin.isFileID()
? includeHashLoc(SM.getFileID(Begin), SM)
: SM.getImmediateExpansionRange(Begin).getBegin()) {
BeginExpansions[SM.getFileID(Begin)] = Begin;
}
// Move up the stack of expansion locations for the end until we find the
// location in BeginExpansions with that has the same file id.
for (SourceLocation End = R.getEnd(); End.isValid();
End = End.isFileID() ? includeHashLoc(SM.getFileID(End), SM)
: toTokenRange(SM.getImmediateExpansionRange(End),
SM, LangOpts)
.getEnd()) {
auto It = BeginExpansions.find(SM.getFileID(End));
if (It != BeginExpansions.end()) {
if (SM.getFileOffset(It->second) > SM.getFileOffset(End))
return SourceLocation();
return {It->second, End};
}
}
return SourceRange();
}
// Find an expansion range (not necessarily immediate) the ends of which are in
// the same file id.
static SourceRange
getExpansionTokenRangeInSameFile(SourceLocation Loc, const SourceManager &SM,
const LangOptions &LangOpts) {
return rangeInCommonFile(
toTokenRange(SM.getImmediateExpansionRange(Loc), SM, LangOpts), SM,
LangOpts);
}
// Returns the file range for a given Location as a Token Range
// This is quite similar to getFileLoc in SourceManager as both use
// getImmediateExpansionRange and getImmediateSpellingLoc (for macro IDs).
// However:
// - We want to maintain the full range information as we move from one file to
// the next. getFileLoc only uses the BeginLoc of getImmediateExpansionRange.
// - We want to split '>>' tokens as the lexer parses the '>>' in nested
// template instantiations as a '>>' instead of two '>'s.
// There is also getExpansionRange but it simply calls
// getImmediateExpansionRange on the begin and ends separately which is wrong.
static SourceRange getTokenFileRange(SourceLocation Loc,
const SourceManager &SM,
const LangOptions &LangOpts) {
SourceRange FileRange = Loc;
while (!FileRange.getBegin().isFileID()) {
if (SM.isMacroArgExpansion(FileRange.getBegin())) {
FileRange = unionTokenRange(
SM.getImmediateSpellingLoc(FileRange.getBegin()),
SM.getImmediateSpellingLoc(FileRange.getEnd()), SM, LangOpts);
assert(SM.isWrittenInSameFile(FileRange.getBegin(), FileRange.getEnd()));
} else {
SourceRange ExpansionRangeForBegin =
getExpansionTokenRangeInSameFile(FileRange.getBegin(), SM, LangOpts);
SourceRange ExpansionRangeForEnd =
getExpansionTokenRangeInSameFile(FileRange.getEnd(), SM, LangOpts);
if (ExpansionRangeForBegin.isInvalid() ||
ExpansionRangeForEnd.isInvalid())
return SourceRange();
assert(SM.isWrittenInSameFile(ExpansionRangeForBegin.getBegin(),
ExpansionRangeForEnd.getBegin()) &&
"Both Expansion ranges should be in same file.");
FileRange = unionTokenRange(ExpansionRangeForBegin, ExpansionRangeForEnd,
SM, LangOpts);
}
}
return FileRange;
}
bool isInsideMainFile(SourceLocation Loc, const SourceManager &SM) {
return Loc.isValid() && SM.isWrittenInMainFile(SM.getExpansionLoc(Loc));
}
llvm::Optional<SourceRange> toHalfOpenFileRange(const SourceManager &SM,
const LangOptions &LangOpts,
SourceRange R) {
SourceRange R1 = getTokenFileRange(R.getBegin(), SM, LangOpts);
if (!isValidFileRange(SM, R1))
return llvm::None;
SourceRange R2 = getTokenFileRange(R.getEnd(), SM, LangOpts);
if (!isValidFileRange(SM, R2))
return llvm::None;
SourceRange Result =
rangeInCommonFile(unionTokenRange(R1, R2, SM, LangOpts), SM, LangOpts);
unsigned TokLen = getTokenLengthAtLoc(Result.getEnd(), SM, LangOpts);
// Convert from closed token range to half-open (char) range
Result.setEnd(Result.getEnd().getLocWithOffset(TokLen));
if (!isValidFileRange(SM, Result))
return llvm::None;
return Result;
}
llvm::StringRef toSourceCode(const SourceManager &SM, SourceRange R) {
assert(isValidFileRange(SM, R));
bool Invalid = false;
auto *Buf = SM.getBuffer(SM.getFileID(R.getBegin()), &Invalid);
assert(!Invalid);
size_t BeginOffset = SM.getFileOffset(R.getBegin());
size_t EndOffset = SM.getFileOffset(R.getEnd());
return Buf->getBuffer().substr(BeginOffset, EndOffset - BeginOffset);
}
llvm::Expected<SourceLocation> sourceLocationInMainFile(const SourceManager &SM,
Position P) {
llvm::StringRef Code = SM.getBuffer(SM.getMainFileID())->getBuffer();
auto Offset =
positionToOffset(Code, P, /*AllowColumnBeyondLineLength=*/false);
if (!Offset)
return Offset.takeError();
return SM.getLocForStartOfFile(SM.getMainFileID()).getLocWithOffset(*Offset);
}
Range halfOpenToRange(const SourceManager &SM, CharSourceRange R) {
// Clang is 1-based, LSP uses 0-based indexes.
Position Begin = sourceLocToPosition(SM, R.getBegin());
Position End = sourceLocToPosition(SM, R.getEnd());
return {Begin, End};
}
std::pair<size_t, size_t> offsetToClangLineColumn(llvm::StringRef Code,
size_t Offset) {
Offset = std::min(Code.size(), Offset);
llvm::StringRef Before = Code.substr(0, Offset);
int Lines = Before.count('\n');
size_t PrevNL = Before.rfind('\n');
size_t StartOfLine = (PrevNL == llvm::StringRef::npos) ? 0 : (PrevNL + 1);
return {Lines + 1, Offset - StartOfLine + 1};
}
std::pair<StringRef, StringRef> splitQualifiedName(StringRef QName) {
size_t Pos = QName.rfind("::");
if (Pos == llvm::StringRef::npos)
return {llvm::StringRef(), QName};
return {QName.substr(0, Pos + 2), QName.substr(Pos + 2)};
}
TextEdit replacementToEdit(llvm::StringRef Code,
const tooling::Replacement &R) {
Range ReplacementRange = {
offsetToPosition(Code, R.getOffset()),
offsetToPosition(Code, R.getOffset() + R.getLength())};
return {ReplacementRange, std::string(R.getReplacementText())};
}
std::vector<TextEdit> replacementsToEdits(llvm::StringRef Code,
const tooling::Replacements &Repls) {
std::vector<TextEdit> Edits;
for (const auto &R : Repls)
Edits.push_back(replacementToEdit(Code, R));
return Edits;
}
llvm::Optional<std::string> getCanonicalPath(const FileEntry *F,
const SourceManager &SourceMgr) {
if (!F)
return None;
llvm::SmallString<128> FilePath = F->getName();
if (!llvm::sys::path::is_absolute(FilePath)) {
if (auto EC =
SourceMgr.getFileManager().getVirtualFileSystem().makeAbsolute(
FilePath)) {
elog("Could not turn relative path '{0}' to absolute: {1}", FilePath,
EC.message());
return None;
}
}
// Handle the symbolic link path case where the current working directory
// (getCurrentWorkingDirectory) is a symlink. We always want to the real
// file path (instead of the symlink path) for the C++ symbols.
//
// Consider the following example:
//
// src dir: /project/src/foo.h
// current working directory (symlink): /tmp/build -> /project/src/
//
// The file path of Symbol is "/project/src/foo.h" instead of
// "/tmp/build/foo.h"
if (auto Dir = SourceMgr.getFileManager().getDirectory(
llvm::sys::path::parent_path(FilePath))) {
llvm::SmallString<128> RealPath;
llvm::StringRef DirName = SourceMgr.getFileManager().getCanonicalName(*Dir);
llvm::sys::path::append(RealPath, DirName,
llvm::sys::path::filename(FilePath));
return RealPath.str().str();
}
return FilePath.str().str();
}
TextEdit toTextEdit(const FixItHint &FixIt, const SourceManager &M,
const LangOptions &L) {
TextEdit Result;
Result.range =
halfOpenToRange(M, Lexer::makeFileCharRange(FixIt.RemoveRange, M, L));
Result.newText = FixIt.CodeToInsert;
return Result;
}
bool isRangeConsecutive(const Range &Left, const Range &Right) {
return Left.end.line == Right.start.line &&
Left.end.character == Right.start.character;
}
FileDigest digest(llvm::StringRef Content) {
uint64_t Hash{llvm::xxHash64(Content)};
FileDigest Result;
for (unsigned I = 0; I < Result.size(); ++I) {
Result[I] = uint8_t(Hash);
Hash >>= 8;
}
return Result;
}
llvm::Optional<FileDigest> digestFile(const SourceManager &SM, FileID FID) {
bool Invalid = false;
llvm::StringRef Content = SM.getBufferData(FID, &Invalid);
if (Invalid)
return None;
return digest(Content);
}
format::FormatStyle getFormatStyleForFile(llvm::StringRef File,
llvm::StringRef Content,
llvm::vfs::FileSystem *FS) {
auto Style = format::getStyle(format::DefaultFormatStyle, File,
format::DefaultFallbackStyle, Content, FS);
if (!Style) {
log("getStyle() failed for file {0}: {1}. Fallback is LLVM style.", File,
Style.takeError());
Style = format::getLLVMStyle();
}
return *Style;
}
llvm::Expected<tooling::Replacements>
cleanupAndFormat(StringRef Code, const tooling::Replacements &Replaces,
const format::FormatStyle &Style) {
auto CleanReplaces = cleanupAroundReplacements(Code, Replaces, Style);
if (!CleanReplaces)
return CleanReplaces;
return formatReplacements(Code, std::move(*CleanReplaces), Style);
}
static void
lex(llvm::StringRef Code, const LangOptions &LangOpts,
llvm::function_ref<void(const syntax::Token &, const SourceManager &SM)>
Action) {
// FIXME: InMemoryFileAdapter crashes unless the buffer is null terminated!
std::string NullTerminatedCode = Code.str();
SourceManagerForFile FileSM("dummy.cpp", NullTerminatedCode);
auto &SM = FileSM.get();
for (const auto &Tok : syntax::tokenize(SM.getMainFileID(), SM, LangOpts))
Action(Tok, SM);
}
llvm::StringMap<unsigned> collectIdentifiers(llvm::StringRef Content,
const format::FormatStyle &Style) {
llvm::StringMap<unsigned> Identifiers;
auto LangOpt = format::getFormattingLangOpts(Style);
lex(Content, LangOpt, [&](const syntax::Token &Tok, const SourceManager &SM) {
if (Tok.kind() == tok::identifier)
++Identifiers[Tok.text(SM)];
// FIXME: Should this function really return keywords too ?
else if (const auto *Keyword = tok::getKeywordSpelling(Tok.kind()))
++Identifiers[Keyword];
});
return Identifiers;
}
std::vector<Range> collectIdentifierRanges(llvm::StringRef Identifier,
llvm::StringRef Content,
const LangOptions &LangOpts) {
std::vector<Range> Ranges;
lex(Content, LangOpts,
[&](const syntax::Token &Tok, const SourceManager &SM) {
if (Tok.kind() != tok::identifier || Tok.text(SM) != Identifier)
return;
if (auto Range = getTokenRange(SM, LangOpts, Tok.location()))
Ranges.push_back(*Range);
});
return Ranges;
}
namespace {
struct NamespaceEvent {
enum {
BeginNamespace, // namespace <ns> {. Payload is resolved <ns>.
EndNamespace, // } // namespace <ns>. Payload is resolved *outer*
// namespace.
UsingDirective // using namespace <ns>. Payload is unresolved <ns>.
} Trigger;
std::string Payload;
Position Pos;
};
// Scans C++ source code for constructs that change the visible namespaces.
void parseNamespaceEvents(llvm::StringRef Code,
const format::FormatStyle &Style,
llvm::function_ref<void(NamespaceEvent)> Callback) {
// Stack of enclosing namespaces, e.g. {"clang", "clangd"}
std::vector<std::string> Enclosing; // Contains e.g. "clang", "clangd"
// Stack counts open braces. true if the brace opened a namespace.
std::vector<bool> BraceStack;
enum {
Default,
Namespace, // just saw 'namespace'
NamespaceName, // just saw 'namespace' NSName
Using, // just saw 'using'
UsingNamespace, // just saw 'using namespace'
UsingNamespaceName, // just saw 'using namespace' NSName
} State = Default;
std::string NSName;
NamespaceEvent Event;
lex(Code, format::getFormattingLangOpts(Style),
[&](const syntax::Token &Tok, const SourceManager &SM) {
Event.Pos = sourceLocToPosition(SM, Tok.location());
switch (Tok.kind()) {
case tok::kw_using:
State = State == Default ? Using : Default;
break;
case tok::kw_namespace:
switch (State) {
case Using:
State = UsingNamespace;
break;
case Default:
State = Namespace;
break;
default:
State = Default;
break;
}
break;
case tok::identifier:
switch (State) {
case UsingNamespace:
NSName.clear();
LLVM_FALLTHROUGH;
case UsingNamespaceName:
NSName.append(Tok.text(SM).str());
State = UsingNamespaceName;
break;
case Namespace:
NSName.clear();
LLVM_FALLTHROUGH;
case NamespaceName:
NSName.append(Tok.text(SM).str());
State = NamespaceName;
break;
case Using:
case Default:
State = Default;
break;
}
break;
case tok::coloncolon:
// This can come at the beginning or in the middle of a namespace
// name.
switch (State) {
case UsingNamespace:
NSName.clear();
LLVM_FALLTHROUGH;
case UsingNamespaceName:
NSName.append("::");
State = UsingNamespaceName;
break;
case NamespaceName:
NSName.append("::");
State = NamespaceName;
break;
case Namespace: // Not legal here.
case Using:
case Default:
State = Default;
break;
}
break;
case tok::l_brace:
// Record which { started a namespace, so we know when } ends one.
if (State == NamespaceName) {
// Parsed: namespace <name> {
BraceStack.push_back(true);
Enclosing.push_back(NSName);
Event.Trigger = NamespaceEvent::BeginNamespace;
Event.Payload = llvm::join(Enclosing, "::");
Callback(Event);
} else {
// This case includes anonymous namespaces (State = Namespace).
// For our purposes, they're not namespaces and we ignore them.
BraceStack.push_back(false);
}
State = Default;
break;
case tok::r_brace:
// If braces are unmatched, we're going to be confused, but don't
// crash.
if (!BraceStack.empty()) {
if (BraceStack.back()) {
// Parsed: } // namespace
Enclosing.pop_back();
Event.Trigger = NamespaceEvent::EndNamespace;
Event.Payload = llvm::join(Enclosing, "::");
Callback(Event);
}
BraceStack.pop_back();
}
break;
case tok::semi:
if (State == UsingNamespaceName) {
// Parsed: using namespace <name> ;
Event.Trigger = NamespaceEvent::UsingDirective;
Event.Payload = std::move(NSName);
Callback(Event);
}
State = Default;
break;
default:
State = Default;
break;
}
});
}
// Returns the prefix namespaces of NS: {"" ... NS}.
llvm::SmallVector<llvm::StringRef, 8> ancestorNamespaces(llvm::StringRef NS) {
llvm::SmallVector<llvm::StringRef, 8> Results;
Results.push_back(NS.take_front(0));
NS.split(Results, "::", /*MaxSplit=*/-1, /*KeepEmpty=*/false);
for (llvm::StringRef &R : Results)
R = NS.take_front(R.end() - NS.begin());
return Results;
}
} // namespace
std::vector<std::string> visibleNamespaces(llvm::StringRef Code,
const format::FormatStyle &Style) {
std::string Current;
// Map from namespace to (resolved) namespaces introduced via using directive.
llvm::StringMap<llvm::StringSet<>> UsingDirectives;
parseNamespaceEvents(Code, Style, [&](NamespaceEvent Event) {
llvm::StringRef NS = Event.Payload;
switch (Event.Trigger) {
case NamespaceEvent::BeginNamespace:
case NamespaceEvent::EndNamespace:
Current = std::move(Event.Payload);
break;
case NamespaceEvent::UsingDirective:
if (NS.consume_front("::"))
UsingDirectives[Current].insert(NS);
else {
for (llvm::StringRef Enclosing : ancestorNamespaces(Current)) {
if (Enclosing.empty())
UsingDirectives[Current].insert(NS);
else
UsingDirectives[Current].insert((Enclosing + "::" + NS).str());
}
}
break;
}
});
std::vector<std::string> Found;
for (llvm::StringRef Enclosing : ancestorNamespaces(Current)) {
Found.push_back(std::string(Enclosing));
auto It = UsingDirectives.find(Enclosing);
if (It != UsingDirectives.end())
for (const auto &Used : It->second)
Found.push_back(std::string(Used.getKey()));
}
llvm::sort(Found, [&](const std::string &LHS, const std::string &RHS) {
if (Current == RHS)
return false;
if (Current == LHS)
return true;
return LHS < RHS;
});
Found.erase(std::unique(Found.begin(), Found.end()), Found.end());
return Found;
}
llvm::StringSet<> collectWords(llvm::StringRef Content) {
// We assume short words are not significant.
// We may want to consider other stopwords, e.g. language keywords.
// (A very naive implementation showed no benefit, but lexing might do better)
static constexpr int MinWordLength = 4;
std::vector<CharRole> Roles(Content.size());
calculateRoles(Content, Roles);
llvm::StringSet<> Result;
llvm::SmallString<256> Word;
auto Flush = [&] {
if (Word.size() >= MinWordLength) {
for (char &C : Word)
C = llvm::toLower(C);
Result.insert(Word);
}
Word.clear();
};
for (unsigned I = 0; I < Content.size(); ++I) {
switch (Roles[I]) {
case Head:
Flush();
LLVM_FALLTHROUGH;
case Tail:
Word.push_back(Content[I]);
break;
case Unknown:
case Separator:
Flush();
break;
}
}
Flush();
return Result;
}
llvm::Optional<DefinedMacro> locateMacroAt(SourceLocation Loc,
Preprocessor &PP) {
assert(Loc.isFileID());
const auto &SM = PP.getSourceManager();
const auto &LangOpts = PP.getLangOpts();
Token Result;
if (Lexer::getRawToken(Loc, Result, SM, LangOpts, false))
return None;
if (Result.is(tok::raw_identifier))
PP.LookUpIdentifierInfo(Result);
IdentifierInfo *IdentifierInfo = Result.getIdentifierInfo();
if (!IdentifierInfo || !IdentifierInfo->hadMacroDefinition())
return None;
// Get the definition just before the searched location so that a macro
// referenced in a '#undef MACRO' can still be found. Note that we only do
// that if Loc is not pointing at start of file.
if (SM.getLocForStartOfFile(SM.getFileID(Loc)) != Loc)
Loc = Loc.getLocWithOffset(-1);
MacroDefinition MacroDef = PP.getMacroDefinitionAtLoc(IdentifierInfo, Loc);
if (auto *MI = MacroDef.getMacroInfo())
return DefinedMacro{IdentifierInfo->getName(), MI};
return None;
}
llvm::Expected<std::string> Edit::apply() const {
return tooling::applyAllReplacements(InitialCode, Replacements);
}
std::vector<TextEdit> Edit::asTextEdits() const {
return replacementsToEdits(InitialCode, Replacements);
}
bool Edit::canApplyTo(llvm::StringRef Code) const {
// Create line iterators, since line numbers are important while applying our
// edit we cannot skip blank lines.
auto LHS = llvm::MemoryBuffer::getMemBuffer(Code);
llvm::line_iterator LHSIt(*LHS, /*SkipBlanks=*/false);
auto RHS = llvm::MemoryBuffer::getMemBuffer(InitialCode);
llvm::line_iterator RHSIt(*RHS, /*SkipBlanks=*/false);
// Compare the InitialCode we prepared the edit for with the Code we received
// line by line to make sure there are no differences.
// FIXME: This check is too conservative now, it should be enough to only
// check lines around the replacements contained inside the Edit.
while (!LHSIt.is_at_eof() && !RHSIt.is_at_eof()) {
if (*LHSIt != *RHSIt)
return false;
++LHSIt;
++RHSIt;
}
// After we reach EOF for any of the files we make sure the other one doesn't
// contain any additional content except empty lines, they should not
// interfere with the edit we produced.
while (!LHSIt.is_at_eof()) {
if (!LHSIt->empty())
return false;
++LHSIt;
}
while (!RHSIt.is_at_eof()) {
if (!RHSIt->empty())
return false;
++RHSIt;
}
return true;
}
llvm::Error reformatEdit(Edit &E, const format::FormatStyle &Style) {
if (auto NewEdits = cleanupAndFormat(E.InitialCode, E.Replacements, Style))
E.Replacements = std::move(*NewEdits);
else
return NewEdits.takeError();
return llvm::Error::success();
}
EligibleRegion getEligiblePoints(llvm::StringRef Code,
llvm::StringRef FullyQualifiedName,
const format::FormatStyle &Style) {
EligibleRegion ER;
// Start with global namespace.
std::vector<std::string> Enclosing = {""};
// FIXME: In addition to namespaces try to generate events for function
// definitions as well. One might use a closing parantheses(")" followed by an
// opening brace "{" to trigger the start.
parseNamespaceEvents(Code, Style, [&](NamespaceEvent Event) {
// Using Directives only introduces declarations to current scope, they do
// not change the current namespace, so skip them.
if (Event.Trigger == NamespaceEvent::UsingDirective)
return;
// Do not qualify the global namespace.
if (!Event.Payload.empty())
Event.Payload.append("::");
std::string CurrentNamespace;
if (Event.Trigger == NamespaceEvent::BeginNamespace) {
Enclosing.emplace_back(std::move(Event.Payload));
CurrentNamespace = Enclosing.back();
// parseNameSpaceEvents reports the beginning position of a token; we want
// to insert after '{', so increment by one.
++Event.Pos.character;
} else {
// Event.Payload points to outer namespace when exiting a scope, so use
// the namespace we've last entered instead.
CurrentNamespace = std::move(Enclosing.back());
Enclosing.pop_back();
assert(Enclosing.back() == Event.Payload);
}
// Ignore namespaces that are not a prefix of the target.
if (!FullyQualifiedName.startswith(CurrentNamespace))
return;
// Prefer the namespace that shares the longest prefix with target.
if (CurrentNamespace.size() > ER.EnclosingNamespace.size()) {
ER.EligiblePoints.clear();
ER.EnclosingNamespace = CurrentNamespace;
}
if (CurrentNamespace.size() == ER.EnclosingNamespace.size())
ER.EligiblePoints.emplace_back(std::move(Event.Pos));
});
// If there were no shared namespaces just return EOF.
if (ER.EligiblePoints.empty()) {
assert(ER.EnclosingNamespace.empty());
ER.EligiblePoints.emplace_back(offsetToPosition(Code, Code.size()));
}
return ER;
}
bool isHeaderFile(llvm::StringRef FileName,
llvm::Optional<LangOptions> LangOpts) {
// Respect the langOpts, for non-file-extension cases, e.g. standard library
// files.
if (LangOpts && LangOpts->IsHeaderFile)
return true;
namespace types = clang::driver::types;
auto Lang = types::lookupTypeForExtension(
llvm::sys::path::extension(FileName).substr(1));
return Lang != types::TY_INVALID && types::onlyPrecompileType(Lang);
}
bool isProtoFile(SourceLocation Loc, const SourceManager &SM) {
auto FileName = SM.getFilename(Loc);
if (!FileName.endswith(".proto.h") && !FileName.endswith(".pb.h"))
return false;
auto FID = SM.getFileID(Loc);
// All proto generated headers should start with this line.
static const char *PROTO_HEADER_COMMENT =
"// Generated by the protocol buffer compiler. DO NOT EDIT!";
// Double check that this is an actual protobuf header.
return SM.getBufferData(FID).startswith(PROTO_HEADER_COMMENT);
}
} // namespace clangd
} // namespace clang
Reference in New Issue View Git Blame Copy Permalink